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turtle.cpp
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turtle.cpp
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#include "turtle.h"
extern "C" {
#include <py/misc.h>
}
#include "../../helpers.h"
#include "../../port.h"
#include "turtle_icon.h"
static constexpr KDSize k_iconSize = KDSize(9, 9);
template <typename T> static inline T * allocate(size_t count) {
/* We forward dynamic allocations to the Python GC so we don't have to bother
* with deallocation. For this to work well, the Turtle object who owns the
* allocated areas need to be added to MicroPython's GC roots, otherwise those
* buffers will be wiped out by the GC too early. */
return static_cast<T*>(m_malloc(sizeof(T) * count));
}
void Turtle::forward(mp_float_t length) {
goTo(
m_x + length * sin(m_heading),
m_y + length * cos(m_heading)
);
}
void Turtle::left(mp_float_t angle) {
setHeading(
((m_heading - k_headingOffset) + (angle * k_headingScale)) / k_headingScale
);
}
void Turtle::goTo(mp_float_t x, mp_float_t y) {
mp_float_t oldx = m_x;
mp_float_t oldy = m_y;
mp_float_t length = sqrt((x - oldx) * (x - oldx) + (y - oldy) * (y - oldy));
if (length > 1) {
// Tweening function
for (int i = 0; i < length; i++) {
mp_float_t progress = i / length;
if (m_speed > 0 && m_speed < k_maxSpeed) {
Ion::Display::waitForVBlank();
}
erase();
if (dot(x * progress + oldx * (1 - progress), y * progress + oldy * (1 - progress))
|| draw())
{
// Keyboard interruption. Return now to let MicroPython process it.
return;
}
}
}
Ion::Display::waitForVBlank();
erase();
dot(x, y);
draw();
}
mp_float_t Turtle::heading() const {
return (m_heading - k_headingOffset) / k_headingScale;
}
void Turtle::setHeading(mp_float_t angle) {
micropython_port_vm_hook_loop();
m_heading = angle * k_headingScale + k_headingOffset;
Ion::Display::waitForVBlank();
erase();
draw();
}
void Turtle::setSpeed(mp_int_t speed) {
if (speed < 0 || speed > k_maxSpeed) {
m_speed = 0;
} else {
m_speed = speed;
}
}
void Turtle::setPenSize(KDCoordinate penSize) {
if (m_penSize == penSize) {
return;
}
if (m_dotMask) {
m_free(m_dotMask);
m_dotMask = nullptr;
}
if (m_dotWorkingPixelBuffer) {
m_free(m_dotWorkingPixelBuffer);
m_dotWorkingPixelBuffer = nullptr;
}
m_penSize = penSize;
}
void Turtle::setVisible(bool visible) {
m_visible = visible;
if (m_visible) {
draw();
} else {
erase();
}
}
// Private functions
KDPoint Turtle::position(mp_float_t x, mp_float_t y) const {
return KDPoint(round(x + k_xOffset), round(y + k_yOffset));
}
bool Turtle::hasUnderneathPixelBuffer() {
if (m_underneathPixelBuffer != nullptr) {
return true;
}
m_underneathPixelBuffer = allocate<KDColor>(k_iconSize.width() * k_iconSize.height());
return (m_underneathPixelBuffer != nullptr);
}
bool Turtle::hasDotMask() {
if (m_dotMask != nullptr) {
return true;
}
m_dotMask = allocate<uint8_t>(m_penSize * m_penSize);
if (m_dotMask == nullptr) {
return false;
}
mp_float_t middle = m_penSize / 2;
for (int j = 0; j < m_penSize; j++) {
for (int i = 0; i < m_penSize; i++) {
mp_float_t distance = sqrt((j - middle)*(j - middle) + (i - middle)*(i - middle)) / (middle+1);
int value = distance * distance * 255;
if (value < 0) {
value = 0;
} else if (value > 255) {
value = 255;
}
m_dotMask[j*m_penSize+i] = value;
}
}
return true;
}
bool Turtle::hasDotBuffers() {
if (m_dotWorkingPixelBuffer == nullptr) {
m_dotWorkingPixelBuffer = allocate<KDColor>(m_penSize * m_penSize);
}
return m_dotWorkingPixelBuffer && hasDotMask();
}
KDRect Turtle::iconRect() const {
KDPoint iconOffset = KDPoint(-k_iconSize.width()/2 + 1, -k_iconSize.height()/2 + 1);
return KDRect(position().translatedBy(iconOffset), k_iconSize);
}
const KDColor * Turtle::icon() {
if (m_iconsPixels == nullptr) {
m_iconsPixels = allocate<KDColor>(k_iconSize.width() * k_iconSize.height() * k_numberOfIcons);
if (m_iconsPixels == nullptr) {
return nullptr;
}
Ion::decompress(
ImageStore::TurtleIcon->compressedPixelData(),
reinterpret_cast<uint8_t *>(m_iconsPixels),
ImageStore::TurtleIcon->compressedPixelDataSize(),
sizeof(KDColor) * k_iconSize.width() * k_iconSize.height() * k_numberOfIcons
);
}
int frame = ((m_heading / (2*M_PI)) * k_numberOfIcons + 0.5);
if (frame < 0) {
frame = k_numberOfIcons - ((-frame) % k_numberOfIcons) - 1;
} else {
frame = frame % k_numberOfIcons;
}
int offset = frame * k_iconSize.width() * k_iconSize.height();
return &m_iconsPixels[offset];
}
bool Turtle::draw() {
MicroPython::ExecutionEnvironment::currentExecutionEnvironment()->displaySandbox();
const KDColor * i = icon();
if (m_visible && i && hasUnderneathPixelBuffer()) {
KDContext * ctx = KDIonContext::sharedContext();
KDRect rect = iconRect();
ctx->getPixels(rect, m_underneathPixelBuffer);
ctx->fillRectWithPixels(rect, i, nullptr);
m_drawn = true;
}
if (m_mileage > 1000) {
if (micropython_port_interruptible_msleep(1 + (m_speed == 0 ? 0 : k_maxSpeed * (k_maxSpeed - m_speed)))) {
return true;
}
m_mileage -= 1000;
}
return false;
}
bool Turtle::dot(mp_float_t x, mp_float_t y) {
MicroPython::ExecutionEnvironment::currentExecutionEnvironment()->displaySandbox();
if (m_penDown && hasDotBuffers()) {
KDContext * ctx = KDIonContext::sharedContext();
KDRect rect(
position(x, y).translatedBy(KDPoint(-m_penSize/2, -m_penSize/2)),
KDSize(m_penSize, m_penSize)
);
ctx->blendRectWithMask(rect, m_color, m_dotMask, m_dotWorkingPixelBuffer);
}
m_mileage += sqrt((x - m_x) * (x - m_x) + (y - m_y) * (y - m_y)) * 1000;
m_x = x;
m_y = y;
return micropython_port_vm_hook_loop();
}
void Turtle::erase() {
if (!m_drawn || m_underneathPixelBuffer == nullptr) {
return;
}
KDContext * ctx = KDIonContext::sharedContext();
ctx->fillRectWithPixels(iconRect(), m_underneathPixelBuffer, nullptr);
m_drawn = false;
}